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Gap Adjusting Mechanism For Rolls On A Roll Stand Used In The Extrusion Forming Of A Sheet Product - Patent 8152509

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1. Field of the Invention This invention relates to extruded sheets and, more particularly, to an apparatus for continuously forming a sheet product using a roll stand with cooperating rolls between which material passes during the sheet product formation process. 2. Background Art Extruded sheets are formed from many different materials, with many different thicknesses, and with different layer constructions. An extruded sheet may be formed by itself or combined with one or more other sheet layers that are concurrentlyformed, or combined after formation. In a typical apparatus for extrusion forming sheet products, a roll stand is placed downstream of an extruder assembly with an associated sheet die. Flowable material is delivered through the sheet die to a nip/lamination location betweenadjacent rolls on the roll stand. The applied material is advanced through a gap between the adjacent rolls defined at the nip/lamination location from where it may be routed between one or more additional roll pairs before it arrives at a downstreamaccumulation location at which the sheet product may be rolled, stacked, packaged, staged, or otherwise handled or processed. In one exemplary roll stand, there is a roll that cooperates with two adjacent rolls, with the rolls cooperating to facilitate layer, and ultimately sheet product, formation. The gaps between adjacent rolls must be variable to allow anapparatus to have the flexibility to make layers of different thicknesses and products with potentially different combinations of sheet layers that may have thicknesses varying over a significant range. Such apparatus may be integrated into a line wherein multiple products with different constitution and/or thickness may be serially produced. Accordingly, it is important that the system operator have the ability to readily and accuratelyadjust the roll gaps to those appropriate for a particular run. Given that gap control may be required at a number of different locations, i

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